Hall credited his 26 mile run at moderate pace.
He also did 23 miles - 10 @ 545, 10 @ 455 and three easy.
I guess since he's the fastest american born marathon and has the fastest debut, we should defer to malmo.
The long run is the most over-rated aspect of athletic training. You could completely do without it if you wanted.
Do everything else right first, only then should you bother with the long run.